Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate FujiFilm S2800HD and Nikon S6400 side-by-side from the front, back and top in their relative dimensions. FujiFilm S2800HD has external dimensions of 110 x 74 x 82 mm (4.33 x 2.91 x 3.23″) and weighs 437 g (0.96 lb / 15.41 oz) (including batteries). Nikon S6400 has external dimensions of 95 x 58 x 27 mm (3.74 x 2.28 x 1.06″) and weighs 150 g (0.33 lb / 5.29 oz) (including batteries).
Below you can see the front view size comparison of FujiFilm S2800HD and Nikon S6400. Nikon S6400 is clearly the smaller of the two cameras. Its body is 15mm narrower, 16mm shorter and 55mm thinner than FujiFilm S2800HD.
Here is the back view size comparison of FujiFilm S2800HD and Nikon S6400.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S6400 is significantly lighter (287g ) than the FujiFilm S2800HD which may become a big advantage especially on long walking trips.
Unfortunately neither FujiFilm FinePix S2800HD (FinePix S2900HD) nor Nikon Coolpix S6400 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Bridge Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
FujiFilm S2800HD and Nikon S6400's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.